Graviton and other particle interections

We know that graviton spin is 2 so other lepton and quarks spin is 1/2 I am confused because If Graviton and a quark or maybe a lepton make an interaction than the last spin must be 3/2 or 5/2 but theres no particle exist in this spin quantity.It means theres no particle called graviton or I dont know I am confused

OK. The point is, in some situations, the interaction is somehow that the particles are going to remain close to each other. In these situations, we say that they formed a bound state, a composite particle. Like a proton which is formed from two up quarks and one down quark.
But for some other situations, the particles just attract or repel each other for some time and then leave each other alone. These are called scattering processes or sometimes collisions.

As for the photon-alpha particle interactions, in case the alpha particle absorbs a photon, it's going to get excited and so will get orbital momentum to conserve the angular momentum. Is giving composite particles for this case good?

Total angular momentum is conserved. Spin is one part, but the motion of particles can contribute to the angular momentum as well.

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I learned that total angular momentum is conserved as indicated above.But I am confused here because total angular momentum is equal spin angular momentum plus orbital angular momentum. In particle interactions like two electron collusions or proton proton collusion every collusions or decays there's no orbital angular momentum(my idea) so I guess total angular momentum must be equal spin angular momentum because theres no orbital momentum so If graviton interects with another particle total angular momentum must be conserved so I claimed that its equal spin angular momentum.Its the reason why I said that graviton and other particle interactions result of spin is 3/2 or 5/2.
Am I wrong.

As for the photon-alpha particle interactions, in case the alpha particle absorbs a photon, it's going to get excited and so will get orbital momentum to conserve the angular momentum. Is giving composite particles for this case good?

Click to expand...

Let's not complicate things when we explain things. It doesn't have to absorb the photon.

Staff: Mentor

I learned that total angular momentum is conserved as indicated above.But I am confused here because total angular momentum is equal spin angular momentum plus orbital angular momentum. In particle interactions like two electron collusions or proton proton collusion every collusions or decays there's no orbital angular momentum(my idea) so I guess total angular momentum must be equal spin angular momentum because theres no orbital momentum so If graviton interects with another particle total angular momentum must be conserved so I claimed that its equal spin angular momentum.Its the reason why I said that graviton and other particle interactions result of spin is 3/2 or 5/2.
Am I wrong.

Click to expand...

As soon as there is more than one particle, you can have "orbital" angular momentum (not really as orbit, but as displaced relative motion).Collision with i.